Thank guys! I've gone a little further and come up with some higher prestiges -- these are raw, no queue scenery (no queues) and no triggered effects. If anybody has done better I'd very much appreciate it if they'd post their sequences!

Loop da Loop 550 161.8 3.49 3.91 4.07 Swing, Loop, Loop, Stall, Reverse Loop, Reverse Loop, Swing (this is the same as above -- I tested a sequence that had three Loops and Reverse Loops instead of two, the prestige was 542 and the Nausea went up to 5.37)

For scenarios I've been taking the approach that I want just enough prestige so guests will ride. Maximizing prestige means that ride duration is so long that profitability is less than optimal. Also, I want to avoid the guest thought that the queue time is too long. So, it's a trade-off between prestige and these other considerations.

My current scenario "rules-of-thumb" - try for prestige 400 or slightly above, and try to avoid "outliers" - rides with substantially more or less prestige than the average. The more you can use scenery to enhance prestige, the better. At least in my parks, guests will ride these and the ride will be profitable.

The Prestige-balance is totally bugged. I managed to get a prestige of 1027 for the Test Flight with the sequence "Loop/Fast Loop/Fast Loop High/Fast Loop/Fast Loop High/Fast Loop/Fast Loop High.
Now all the peeps are flocking to that ride, culminating in outlandish queue-times.
The Wild Mouse coaster that I bullt, while having good stats, barely got a prestige of 400. Nobody ever wants to ride it and it just sits there costing me money.
This should really be fine-tuned.

The Prestige-balance is totally bugged. I managed to get a prestige of 1027 for the Test Flight with the sequence "Loop/Fast Loop/Fast Loop High/Fast Loop/Fast Loop High/Fast Loop/Fast Loop High.
Now all the peeps are flocking to that ride, culminating in outlandish queue-times.
The Wild Mouse coaster that I bullt, while having good stats, barely got a prestige of 400. Nobody ever wants to ride it and it just sits there costing me money.
This should really be fine-tuned.

Didn´t work for me. Guests wouldn´t go near any of the rides with a 400 prestige. Each of my coasters usually has a prestige of 900 - 1300.
The Wild Mouse is definitely too low. Especially if you ever rode the Blackpool Mouse (on which the Planco Mouse is based), you know what a thrilling and funny ride it was.

The Test Flight on the other hand shouldn´t have a prestige that equals a huge steel coaster.

Since today's bugfix update (Build 1.7.3.55668) didn't fix the problem with Centrum's missing Reverse Loop High (yep, just checked), I've come up with a sequence nearly as high-prestige that doesn't use it:

Guys, I've got some Real Life™ things happening, and won't be able to get back into PlanCo stuff till next year -- hopefully early next year, but no guarantees. I'd appreciate it if people finding high-prestige ride sequences for the new flats would post 'em here -- thanks!